refactor(assets): vendor 资产迁入标准目录并全仓去除 zibll 标识

- assets/vendor 全量迁移: fontawesome5→assets/fontawesome5, css→assets/css,
  js→assets/js/runtime(避开 14 个同名自有文件), img 合并去重→assets/img,
  fonts→assets/fonts; 删除 assets/vendor
- libs 五个与 widgets/third-party 字节相同的库不重复入库, loader paths 改指向
- 运行时切换: _win.uri=assets 根, loader baseUrl=/js/runtime, enlighter 注入
  路径同步; PHP 7 个引用文件切换并改名 $zibll_*→$runtime_*
- 去品牌: Qinver 头注释/品牌 console.log/演示链接清除, 默认文案中性化
- 功能标识符改名: zib__→aksrt__, zib_ajax→aksrt_ajax, window.zib→
  window.aksrtLegacy, zibllblock/*→aksrtblock/*, .zib-widget→.aksrt-panel,
  .zib-slider→.aksrt-slider, zib_menu_options meta 键等
- 自有 CSS 改名: legacy-utilities/compat-vars/footer shell
- admin SPA 重建; 契约测试同步(路径/断言/文件更名)
- 例外保留: tests/visual 对照环境与 fixtures 前缀(外部 Zibll 产品引用)

验证: php -l 133 个改动文件通过; runtime 86 个 JS node --check 通过;
契约测试 68/70(2 个失败经 stash 对照确认为存量问题)

inc/helpers/header/aksrt-header-navbar.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Desktop navbar pieces (zibll navbar header / menu / buttons).
+ * Desktop navbar pieces (legacy navbar header / menu / buttons).
  *
  * @package AKSRT
  */
@@ -9,7 +9,7 @@ defined('ABSPATH') || exit;
 
 if (!function_exists('aksrt_menu_items')) :
 	/**
-	 * PC top menu (zibll zib_menu_items).
+	 * PC top menu (legacy).
 	 *
 	 * @param string $location Menu location.
 	 * @param bool   $echo     Echo or return.
@@ -56,7 +56,7 @@ endif;
 
 if (!function_exists('aksrt_navbar_header')) :
 	/**
-	 * Logo + mobile toggles (zibll zib_navbar_header).
+	 * Logo + mobile toggles (legacy).
 	 *
 	 * @param array<string,mixed> $ctx
 	 */
@@ -87,7 +87,7 @@ endif;
 
 if (!function_exists('aksrt_get_menu_search')) :
 	/**
-	 * Layout-2 inline search form (zibll zib_get_menu_search simplified).
+	 * Layout-2 inline search form (legacy simplified).
 	 *
 	 * @param array<string,mixed> $ctx
 	 */
@@ -97,7 +97,7 @@ if (!function_exists('aksrt_get_menu_search')) :
 		}
 		$placeholder = (string) ($ctx['search_placeholder'] ?? __('搜索内容', 'aksrt'));
 
-		// zibll: form + input + remote-box (action=menu_search).
+		// legacy: form + input + remote-box (action=menu_search).
 		echo '<form method="get" class="navbar-form navbar-left hover-show" action="' . esc_url(home_url('/')) . '">';
 		echo '<div class="form-group relative dropdown">';
 		echo '<input type="text" class="form-control search-input focus-show" name="s" value="'
@@ -213,7 +213,7 @@ if (!function_exists('aksrt_header_user_box_html')) :
 				$href .= '<a rel="nofollow" target="_blank" href="' . esc_url((string) $ctx['theme_settings_url']) . '">';
 				$href .= '<div class="badg mb6 toggle-radius c-yellow"><i class="fa fas fa-sliders-h" aria-hidden="true"></i></div>';
 				$href .= '<div class="c-yellow">' . esc_html__('主题设置', 'aksrt') . '</div></a>';
-				// zibll: 模块布局 → widgets.
+				// legacy: 模块布局 → widgets.
 				$href .= '<a rel="nofollow" target="_blank" href="' . esc_url(admin_url('widgets.php')) . '">';
 				$href .= '<div class="badg mb6 toggle-radius c-yellow"><i class="fa fas fa-chart-pie" aria-hidden="true"></i></div>';
 				$href .= '<div class="c-yellow">' . esc_html__('模块布局', 'aksrt') . '</div></a>';
@@ -278,7 +278,7 @@ endif;
 
 if (!function_exists('aksrt_menu_button')) :
 	/**
-	 * Right cluster: fold, publish/VIP, theme, user, search (zibll zib_menu_button).
+	 * Right cluster: fold, publish/VIP, theme, user, search (legacy).
 	 *
 	 * @param array<string,mixed> $ctx
 	 */